BRIEF [O.A.] Bulova, Josef Adolf Author: Bulova, Josef Adolf Recipient: Haeckel, Ernst Dating: 21.08.1879
BRIEF [O.A.] Bulova, Josef Adolf Author: Bulova, Josef Adolf Recipient: Haeckel, Ernst Dating: 28.04.1900
BRIEF [O.A.] Bulova, Josef Adolf Author: Bulova, Josef Adolf Recipient: Haeckel, Ernst Dating: 05.11.1901
BRIEF [O.A.] Bulova, Josef Adolf Author: Bulova, Josef Adolf Recipient: Haeckel, Ernst Dating: 18.02.1902